6 files changed, 36 insertions, 6 deletions
diff --git a/library/std/src/sys/pal/hermit/io.rs b/library/std/src/sys/pal/hermit/io.rs
index aad1eef71e9..0424a1ac55a 100644
--- a/library/std/src/sys/pal/hermit/io.rs
+++ b/library/std/src/sys/pal/hermit/io.rs
@@ -33,7 +33,7 @@ impl<'a> IoSlice<'a> {
     }
 
     #[inline]
-    pub fn as_slice(&self) -> &[u8] {
+    pub const fn as_slice(&self) -> &'a [u8] {
         unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
 }
@@ -71,6 +71,11 @@ impl<'a> IoSliceMut<'a> {
     }
 
     #[inline]
+    pub const fn into_slice(self) -> &'a mut [u8] {
+        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+    }
+
+    #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
diff --git a/library/std/src/sys/pal/solid/io.rs b/library/std/src/sys/pal/solid/io.rs
index 4b1f788a492..9ef4b7049b6 100644
--- a/library/std/src/sys/pal/solid/io.rs
+++ b/library/std/src/sys/pal/solid/io.rs
@@ -33,7 +33,7 @@ impl<'a> IoSlice<'a> {
     }
 
     #[inline]
-    pub fn as_slice(&self) -> &[u8] {
+    pub const fn as_slice(&self) -> &'a [u8] {
         unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
 }
@@ -71,6 +71,11 @@ impl<'a> IoSliceMut<'a> {
     }
 
     #[inline]
+    pub const fn into_slice(self) -> &'a mut [u8] {
+        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+    }
+
+    #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
diff --git a/library/std/src/sys/pal/unix/io.rs b/library/std/src/sys/pal/unix/io.rs
index 181c35a971e..0d5a152dc0d 100644
--- a/library/std/src/sys/pal/unix/io.rs
+++ b/library/std/src/sys/pal/unix/io.rs
@@ -33,7 +33,7 @@ impl<'a> IoSlice<'a> {
     }
 
     #[inline]
-    pub fn as_slice(&self) -> &[u8] {
+    pub const fn as_slice(&self) -> &'a [u8] {
         unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
 }
@@ -71,6 +71,11 @@ impl<'a> IoSliceMut<'a> {
     }
 
     #[inline]
+    pub const fn into_slice(self) -> &'a mut [u8] {
+        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+    }
+
+    #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
diff --git a/library/std/src/sys/pal/unsupported/io.rs b/library/std/src/sys/pal/unsupported/io.rs
index 6372fca74e0..604735d32d5 100644
--- a/library/std/src/sys/pal/unsupported/io.rs
+++ b/library/std/src/sys/pal/unsupported/io.rs
@@ -15,7 +15,7 @@ impl<'a> IoSlice<'a> {
     }
 
     #[inline]
-    pub fn as_slice(&self) -> &[u8] {
+    pub const fn as_slice(&self) -> &'a [u8] {
         self.0
     }
 }
@@ -41,6 +41,11 @@ impl<'a> IoSliceMut<'a> {
     }
 
     #[inline]
+    pub const fn into_slice(self) -> &'a mut [u8] {
+        self.0
+    }
+
+    #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         self.0
     }
diff --git a/library/std/src/sys/pal/wasi/io.rs b/library/std/src/sys/pal/wasi/io.rs
index b7c2f03daa0..57f81bc6257 100644
--- a/library/std/src/sys/pal/wasi/io.rs
+++ b/library/std/src/sys/pal/wasi/io.rs
@@ -30,7 +30,7 @@ impl<'a> IoSlice<'a> {
     }
 
     #[inline]
-    pub fn as_slice(&self) -> &[u8] {
+    pub const fn as_slice(&self) -> &'a [u8] {
         unsafe { slice::from_raw_parts(self.vec.buf as *const u8, self.vec.buf_len) }
     }
 }
@@ -68,6 +68,11 @@ impl<'a> IoSliceMut<'a> {
     }
 
     #[inline]
+    pub const fn into_slice(self) -> &'a mut [u8] {
+        unsafe { slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.buf_len) }
+    }
+
+    #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         unsafe { slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.buf_len) }
     }
diff --git a/library/std/src/sys/pal/windows/io.rs b/library/std/src/sys/pal/windows/io.rs
index 1e7d02908f6..f2865d2ffc1 100644
--- a/library/std/src/sys/pal/windows/io.rs
+++ b/library/std/src/sys/pal/windows/io.rs
@@ -36,7 +36,7 @@ impl<'a> IoSlice<'a> {
     }
 
     #[inline]
-    pub fn as_slice(&self) -> &[u8] {
+    pub const fn as_slice(&self) -> &'a [u8] {
         unsafe { slice::from_raw_parts(self.vec.buf, self.vec.len as usize) }
     }
 }
@@ -75,6 +75,11 @@ impl<'a> IoSliceMut<'a> {
     }
 
     #[inline]
+    pub const fn into_slice(self) -> &'a mut [u8] {
+        unsafe { slice::from_raw_parts_mut(self.vec.buf, self.vec.len as usize) }
+    }
+
+    #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         unsafe { slice::from_raw_parts_mut(self.vec.buf, self.vec.len as usize) }
     }